clang-format: Indent from dict literal labels.

Before:
  @{
    NSFontAttributeNameeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee :
    regularFont,
  };

After:
  @{
    NSFontAttributeNameeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee :
        regularFont,
  };

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204041 91177308-0d34-0410-b5e6-96231b3b80d8